With that said, you should have a spare device, but if you don't mind troubleshooting issues (you can always rollback to the previous OS should things get really bad) then by all means dive right in. There will be some features that break after updates, that could potentially include the ability to dial a phone number. Microsoft does an excellent job in its official announcement of the preview builds of setting proper expectations. The beta comes with a few caveats, as is typically the case with software still under development.
